It is my understanding that being cold doesn’t make us sicker (aside from pneumonia) so why is there actually a season where illnesses like the common cold and flu spread faster? Shouldn’t people get sick at the same rate all year?
In: Biology
Also your vitamin D levels get lower in shorter and colder and cloudier weather. Vitamin D helps immune system fight viruses and tuberculosis. Hence the cod liver oil .
[Vit D and seasonal respiratory infections](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3543548/)
[Vit D and TB risk](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5207333/)
NB: there are some studies that disagree with this.
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